Step 1: In Activity mode (the green play button) press F6 and drag a Pioneer from the blueprint Library. Also drag any weapons you want in their hands.















Step 2: With the Pioneer selected drag from the little circle that says AI and drag away from it and let go. This makes this pioneer AI controlled, you can also drag from "In Hands" to any weapon you want it holding.




Step 3: Still having the bot selected, go to the Activity Editor and uncheck the "Start as player controlled". You can also set a Team tag here. If you wanted to have an AI on the same team as the Pioneer you can set both the Pioneer and the AI team tag here.



And that's it!